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@britte gisten strn @fitta SAMUEL G. CABELL, OF QUNCY, LLNOS. LettersPatent LVO. 66.001,4daef2 June 25, 1867.

IMPROVMENT IE ELECTRO-MAGNETS.

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TO ALL WHOM 1T MAY CONCERN:

Be it known that I, SAMUEL G. CABELL, of Quincy, in Adams county, andState of Illinois, have invented e. new and useful Improvement inEleotro-Magnetsg and I do hereby declare that the following is a full,clear, and exact description thereof, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,forming part of this specication, in which- Figur'e 1 represents alongitudinal section of a. single electro-magnet constructed accordingto my invention.

Figure 2 is a View of the same partly in section and partly inelevation.

Figure 3 is a traiisverse section of the same.

The same letters occurring upon the severa-l figures indicatecorresponding parts.

The nature of my invention consists in combining with the central softiron core of a helical electro-magnet a sheath or casing to the helix,of the same or similar suitable material, and using said sheath as a.core for the extension of the helix to be again sheathed in like manner,which may be repeated any number of times, thus increasing theattractive power ot' the magnet ad Zz'btum.

To enable others to make and use my invention, I will proceed todescribe its construction and operation by referring to the drawings, inwhich r A represents the core, preferably of soft iron or other suitablematerial, around which is coiled a copper wire, b, insulated by beingwrapped with thread, or coated with gutta percha or any like suitablesubstance, and which is coiled closely over the entire length of thecore, and over this coil is pla'ced a sheath or tube, c, also preferablyof soft iron, which is connected at its one end by an annular collar, d,with the central core. The insulateduire passing through :in aperture,e, at or near the end of the sheath c, is coiled around it in likemanner for its entire length, and is then sheathed by the tube f, whichisv connected with the tube c by an annular collar, g, or in anysuitable manner. Thus alternately1 the helix and sheath may be repeatedad z'njnz'um, und the power of the magnet compounded in proportion. Thetwo ends of the' helix are connected with the battery H in the usualmanner, and need no further description here.

It is obvious that a horseshoe magnet may bc constructed on the saineplan by simply connecting two of the legs thus constructed by a suitablebur, and properly arranging the wires to form the necessary connections.

It will be evident that this magnet may be constructed so as to bemounted horizontally or in any suitable position for operating on anarmature for telegraphing or other purposes.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

A compound magnet consisting of two or more helices enclosed in softiron tubes, with the tubes so arranged as to separate the helices, andboth tubes and helices arranged concentrically around a central tube orbar, as herein described.

S. G. CABELL.

Witnesscs:`

W. Mounts SMITH, H. C. ELLIOTT.

